Why Kroenke didn't move last year and why no definite NFL LA answer yet:
When Kroenke was good to go to LA, last year, Spanos flipped! telling the NFL he did everything procedurally every year of what was ask of him by the NFL and now this "Johnny come lately" bully Kroenke is just going to take the LA market just like that? Foul, not fair! NFL came back to Kroenke and told him to hold off, let us take a year, slow down, and help your fellow owners to prevent a legal and PR mess on our hands. Kroenke agreed. The result you see for yourself: Oakland, San Diego, and StL all on overdrive in stadium planning! NFL wants the Chargers and Raiders to move to LA and the Rams to stay in StL but Stan Kroenke's elbows are too big and Goodell knows that, there is ultimately no stopping Stan. We are in a holding pattern until early October, for Spanos to figure out what he wants to do.
Scenario #1: If there is a "knock your socks off" deal in San Diego and he stays then Kroenke will be along in LA. The Raiders will not join him as 2nd tenants because Spanos's problem is not just one: need a new stadium. It's two fold: being financial viable which includes business from Southern California other than the San Diego market! This is why if Chargers stay in San Diego, the LA market will be a one team, until enough market research is done to see/show how if adding another tenant in Ingelwood will be detrimental to both the Rams and Chargers. That will be perfect for Kroenke. One he will have the LA market for himself to root himself deeper with corporate sponsorship and get the first shot at new fans (fans who are not right now Rams fans) and two, after he established himself in the LA market, it will be financially beneficial to add a 2nd tenant in his stadium. The money he makes from the 2nd tenant will offset some business loss to the new 2nd team in LA! however this is IF AND ONLY IF, market research shows no financial damage to Spanos and Kroenke with a third team in Southern California. An added bonus, the second home locker will preserve LA's "leverage city" for the NFL.
Scenario #2: San Diego drops the ball again and Spanos finally decides after 54 years he is done in San Diego, then look for a NFL brokered deal between Kroenke and Spanos to share LA. Now, Scenario #2 opens a can of worms:
Worm #1: Do Rams and Chargers stay in their respective cities and move in together in 2018? Not likely, that's six lame duck seasons in total for the NFL. Plus, Kroenke will not agree.
Worm #2: Do the Rams play the Rose Bowl, Chargers play the Coliseum for two years (or the other way around) and they move in together to Ingelwood in 2018? Likely. But that will mean Spanos is now absolutely done with San Diego and has successfully negotiated a temporary stadium for himself in LA. But is Stan happy not getting a running start in LA even though he is taking all the land development risks? Probably not.
Worm #3: Do the Rams move in 2016 to the Rose Bowl, Spanos stays in San Diego and now clearly leverages Kroenke's 2nd home locker room to squeeze the best deal out of San Diego for two years either in good faith or to buy himself time for the stadium to be built in Ingelwood? This is the very likely outcome staring October and moving forward.
By the way, Raiders are irrelevant to the LA market. Most likely they will be pushed by the NFL as 2nd tenants to the 49ers if Oakland drops the ball in keeping them. StL will be placed on the expansion team list if their stadium is shovel and financially ready needing only a new owner's commitment.